<?php
require_once 'config21.php';
if (!isset($_SESSION['userid'])) {
    header('Location: login21.php');
    exit;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>国家鸟类信息管理系统</title>
    <link rel="stylesheet" href="style21.css">
</head>
<body>
    <header>
        <h1>国家鸟类信息管理系统</h1>
    </header>
    <nav>
        <a href="list_nationalbird21.php">国家鸟类列表</a>
        <a href="list_introduce21.php">鸟类介绍列表</a>
        <a href="logout21.php">退出登录</a>
    </nav>
    <div class="container">
        <p>欢迎使用国家鸟类信息管理系统!</p>
    </div>
</body>
</html>